*{
	margin:0;
	padding: 0;
	-webkit-tap-highlight-color:transparent;
	box-sizing: border-box;
	-webkit-box-sizing:border-box;

}
body{
	font-size: 14px;
	font-family: "黑体";
	color: #333;
	min-width: 320px;
	max-width: 640px;
	margin: 0 auto;
	

}
a{
	color: #333;
	text-decoration: none;
}
a:hover{
	text-decoration: none;
}
input{
	border: none;
	outline: none;
	-webkit-appearance:none;
}
ul,ol{
	list-style: none;
}
/*头部*/
header{
	text-align: center;
	width: 100%;
	height: 50px;
	display: flex;
	align-items: center;
}
div>.button{
	width: 50px;
	height: 50px;
	background-color: black;
	background-image: url(../images/left_arrow.png);
	background-size: 20px 20px;
	background-position: 13px 13px; 
	background-repeat: no-repeat;
	align-content: center; 
	border: none;
}
header *{
	color: white;
}
header>h4{
	flex-grow: 1;
	font-size: 20px;
	font-weight: bold;
}
header>a{
	justify-content: flex-end;
	margin: auto;
	margin-right: 10px;
	font-size: 16px;
	color: rgb(37,191,175);
}
.ys_boss{
	width: 100%;
	max-width: 640px;
	min-width: 320px;
	margin: 0 auto;
	background-color: rgb(238,238,238);
}
.ys_boss>.ys_banner{
	background-color: black;
}
/*中部*/
.center{
	width: 100%;
	background-color: rgb(255,255,255);


}
.center>.center_img1{
	height: 670px;
	width: 100%;
}
.center>.center_text1{
	height: 295px;
	width: 266px;
	background-color: rgba(0,0,0,0.7);
	margin: -450px auto 0;
	/*margin-left: 100px;*/
	border:2px solid yellow;
	position: relative;
	z-index: 10;
	
}
.center>.center_text1>div{
	color: yellow;
	width: 80%;
	
	margin-left: 25px;
	margin-top: 25px;
	font-size: 1.1rem;
}
.center>.cneter_home{
	max-width: 640px;
	height: 30px;
	width: 40px;
	/*background-color: rgba(0,0,0,0.7);*/
	border:1px solid white;
	position: fixed;
	/*right: 0;*/
	margin: 600px 92.5% 0;
	border-radius: 5px;
}
.center>.cneter_home>a{
		color: white;
		padding-left:10px;
		font-size: 1.1rem;
}
.center>.cneter_home>a>img{
	width: 20px;
	height: 20px;
	margin-top: 5px;
}
.center_img2{
	width: 100%;
	height: 630px;
}
.center>.center_text2{
	height: 660px;
	width: 300px;
	border-bottom: 2px solid black;
	border-top: 2px solid black;
	margin: -100px auto 0;
	background-color: white;
	position: relative;
	z-index: 10;
}
.center>.center_text2>div{
	width: 80%;
	font-size: 1.1rem;
	margin-left: 30px;
	margin-top: 20px;
}
.center_nav{
	display: flex;
	flex-direction: column;
	border-bottom: 1px solid #e0e0e0;
	background-color: white;
}
.center_nav>.center_nav1{
	display: flex;
	justify-content: space-around;
	margin-top:10px;
	margin-bottom: 10px;
}
.center_nav>.center_nav1>.center_nav_friends{
	margin: 0 auto;
	width: 40%;
}
.center_nav_friends>img{
	width: 100%;
	height: 200px;
	margin: 0 auto;
	border-radius: 30px;
}

.center>.center_text3{
	height: 760px;
	width: 300px;
	border-bottom: 2px solid black;
	border: 2px solid black;
	margin: -100px auto 0;
	background-color: rgb(255,255,255);
	position: relative;
	z-index: 10;


}
.center>.center_text3>div{
	width: 80%;
	font-size: 1.1rem;
	margin-left: 30px;
	margin-top: 20px;

}
.center>.center_text4{
	height: 250px;
	width: 300px;
	border-bottom: 2px solid black;
	border-top: 2px solid black;
	margin: -100px auto 0;
	background-color: white;
	position: relative;
	z-index: 10;
}
.center>.center_text4>div{
	width: 80%;
	font-size: 1.1rem;
	margin-left: 30px;
	margin-top: 20px;
}
.center>.center_text5{
	height: 350px;
	width: 300px;
	border-bottom: 2px solid black;
	border-top: 2px solid black;
	margin: -100px auto 0;
	background-color: white;
	position: relative;
	z-index: 10;
}
.center>.center_text5>div{
	width: 80%;
	font-size: 1.1rem;
	margin-left: 30px;
	margin-top: 20px;
}
.center>.center_text6{
	height: 350px;
	width: 300px;
	border-bottom: 2px solid black;
	border-top: 2px solid black;
	margin: -100px auto 0;
	background-color: white;
	position: relative;
	z-index: 10;
}
.center>.center_text6>div{
	width: 80%;
	font-size: 1.1rem;
	margin-left: 30px;
	margin-top: 20px;
}.center>.center_text7{
	height: 250px;
	width: 300px;
	border-bottom: 2px solid black;
	border-top: 2px solid black;
	margin: -100px auto 0;
	background-color: white;
	position: relative;
	z-index: 10;
}
.center>.center_text7>div{
	width: 80%;
	font-size: 1.1rem;
	margin-left: 30px;
	margin-top: 20px;
}
.content_footer{
	width: 100%;
	height: 100px;
	background-color: rgb(189,189,185);
	margin:auto;
	display: flex;
	align-items: center;
}
.content_footer>img{
	margin:auto;
	height: 100%;

}
/*尾部*/
.ys_footer{
	position: fixed;
	
	bottom:0%;
	height: 50px;
	width: 100%;
	z-index: 1000;
	display: flex;
	align-items: center;
	background-color: black;
	box-shadow: 0px 1px 3px ;
	min-width: 320px;
	max-width: 640px;
}

.ys_img3{
	height: 100%;
	width: 20%;	
	padding-top: 3px;
}
.ys_img4{
	height: 100%;
	width: 20%;
	padding-top: 2px;
}
.ys_img5{
	height: 100%;
	width: 20%;
	padding-top: 5px;
}
.menu{
	height: 100%;
	width: 35%;
	background-color: rgb(60,148,139);
	color: white;
	font-size: 1.3rem;
	text-align: center;
	line-height: 50px;

}
.menu1{
	height: 100%;
	width: 35%;
	background-color: rgb(60,148,139);
	color: white;
	font-size: 1.3rem;
	text-align: center;
	line-height: 50px;
	display: none;
}
.ys_footer2{
	list-style: none;
	height: 200px;
	width: 35%;
	background-color: black;
	color: white;
	font-size: 1.2rem;
	position: fixed;
	top: 100%;
}
.ys_footer2>li{
	color: white;
}
.ys_footer2>a{
	color: white;
	padding: 10px;

}